In the 16-22yards between the where a bowler or umpire will be when a batsmen smokes it back, I honestly don't think the reaction time between this bat and a standard powerbow for instance, will make a difference.
It's gonna be milliseconds, it's not even gonna be a second difference.
The difference comes from the intent in today's game. Players train to hit hard, to be stronger, to be fitter, practice range hitting.
Chris gayle smoking one straight with a standard cleft, or with a low density cleft is still going to cause issues if it hits either of the two people we are worried about.
Look at the pic on Twitter, was antherton, and Fairbrother sat outside Taj Mahal, both looked like skinny teens, then under was root, and buttler recreating pic, They look liked sportsman who train in comparison
Today's cricketers are just built better.